/*
 * Copyright (c) 2009, 2012 IBM Corp.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Dave Locke - initial API and implementation and/or initial documentation
 */
package org.eclipse.paho.client.mqttv3.internal.wire;

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;

import org.eclipse.paho.client.mqttv3.MqttException;

/**
 * An on-the-wire representation of an MQTT CONNACK.
 */
public class MqttConnack extends MqttAck {

    private int returnCode;

    public MqttConnack(byte info, byte[] variableHeader) throws Exception {
        super(MqttWireMessage.MESSAGE_TYPE_CONNACK);
        ByteArrayInputStream bais = new ByteArrayInputStream(variableHeader);
        DataInputStream dis = new DataInputStream(bais);
        dis.readByte();
        returnCode = dis.readUnsignedByte();
        dis.close();
    }

    public int getReturnCode() {
        return returnCode;
    }

    protected byte[] getVariableHeader() throws MqttException {
        // Not needed, as the client never encodes a CONNACK
        return new byte[0];
    }

    /**
     * Returns whether or not this message needs to include a message ID.
     */
    public boolean isMessageIdRequired() {
        return false;
    }

    public String getKey() {
        return new String("Con");
    }
}
